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Def Leppard rocker Vivian Campbell is undergoing a new round of chemotherapy treatment after doctors discovered his cancer had returned.

The guitarist went public with his Hodgkin's lymphoma diagnosis last summer, but announced in November that he was in remission.

However, Campbell has now revealed he has been struck down by the disease once more.

In a new interview with Florida radio station 98.7 The Gater, he insists he is "doing good", but admits the cancer "seems to be... coming back again".

Campbell claims he is "not concerned" about the devastating blow to his health, adding, "It's just a process. I mean, it always was a little bit touch-and-go. But, you know, it's just a process to get through. I mean, like I said, it's absolutely nothing I'm concerned about, but it's something I need to start the process, I need to get a handle on, so that I am free and clear to tour this summer."

Campbell is due to join his Def Leppard bandmates on tour this June when they hit the road for a 40-city trek with KISS.

Meanwhile, Campbell's health setback is not expected to affect recording sessions for the Pour Some Sugar On Me hitmakers' next album, the follow-up to 2008's Songs From The Sparkle Lounge, which is coming together in segments.

He says, "Our third and final instalment will be in November, to finish up the record. We're hoping for a release for early spring, 2015."